add note about pagemap/pages .img
[[Image:Memory_migration_with_page_server.png|thumb|500px|right|Memory migration with page server]]
When using page server, the memory is dumped not to disk, but directly to network, thus eliminating any disk reads/writes on the source. On the destination system, a page server runs, receiving the data from network and writing it to files on disk or tmpfs.
=== Pages deduplication ===